MP4 to WebM Converter
Fixpio’s mp4 to webm converter turns a short MP4 clip into a WebM file for a website, blog or web project — and it does the whole job inside your browser. Add your MP4, let it play through once while your browser records it as WebM, then download the result. Nothing is uploaded to a server, so your video stays on your device the entire time. Because the clip is re-recorded as it plays, a short clip is the right job for this tool: allow roughly the length of the video itself for the conversion.
Convert MP4 to WebM
Add an MP4 clip below and download it back as a WebM file.
Drop your MP4 file here
or choose a file stored on this device
Works with MP4 files your browser can play. The video is played and re-recorded as WebM in real time, so short clips work best, and the tab needs to stay open while it plays.
Why people convert MP4 files to WebM
Three reasons a web clip often works better as WebM than as MP4.
Built for website video
Hero videos, background loops, product demos and blog embeds are WebM’s home ground. It plays natively in most modern browsers through a standard HTML5 video element, with no player or plugin to add.
Private from start to finish
Most converters ask you to hand your video to a server. This one never asks: the clip is played and re-recorded on your own machine, then handed straight back to you. Nothing is uploaded at any point.
An open format for web projects
Web developers and open-source projects often prefer WebM because the format is royalty-free and designed for the web from the start — a straightforward fit for sites, apps and shared web clips, including forums and Discord within their file-size limits.
About this converter
People usually convert mp4 to webm at the moment a clip is headed for a web page: a looping hero video on a homepage, a short product demo in a blog post, or a screen recording that needs to sit inside an HTML5 video element instead of a heavyweight player. This page is built for exactly that moment. It is a free converter that works mp4 to webm online in your browser, so there is no program to install and no account to create before you can start — and no server ever receives your file.
A word on how it works, because it affects which clips suit it: your browser plays the MP4 and records that playback as WebM, in real time. That makes it a re-encode rather than a perfect bit-for-bit copy, so quality depends on your source video and the recording, and a three-minute clip takes roughly three minutes. For the webm vs mp4 choice itself, keep the MP4 as your all-purpose original — it plays almost everywhere — and use the WebM alongside it on the page, where its typically smaller size at similar quality helps the page load sooner.
Frequently asked questions
Straight answers about timing, quality, formats and privacy.
How do I convert an MP4 to WebM on this page?
Add your MP4 file using the upload box — drag it in or browse for it — then press Convert to WebM. Keep the tab open: your browser plays the clip through and records it as WebM, then offers the finished file as a download. No server is involved at any step.
How long does the conversion take?
About as long as the video itself. This converter works by playing your MP4 and re-recording it in real time, so a 30-second clip takes roughly 30 seconds and a 3-minute clip takes roughly 3 minutes. That is why short clips suit it best, and why very long or very large videos are impractical here — for a full-length video, a desktop converter is the better tool.
Will the WebM look as good as my MP4?
Close, for most short web clips — but not identical. The result is a fresh recording of your video playing, not a bit-for-bit copy, so quality depends on the source file and on your browser’s recording. A clean, high-quality MP4 gives the best result; converting cannot add detail the original never had, so check the download before you publish anything important. Audio is kept when your browser can play the source audio; if the source cannot play in your browser, it cannot be re-recorded here.
What is the difference between WebM and MP4 — and will WebM be smaller?
MP4 is the all-purpose format: it plays on almost every phone, TV, editor and platform. WebM is the open, royalty-free format built specifically for web video, typically pairing VP8/VP9 video with Opus/Vorbis audio. At similar quality a WebM is typically smaller than the equivalent MP4, which is why websites favour it — but with this tool the output is a real-time re-recording, so treat ‘typically smaller’ as the format’s tendency, not a promise for every clip, and compare the two files once yours has downloaded. A common website setup is to offer both: WebM first, MP4 as the fallback.
Will my WebM play in Safari and other browsers?
In most modern browsers, yes. Chrome, Firefox and Edge have played WebM natively for years, and newer versions of Safari support WebM video too — support there arrived later and is less consistent on older systems, which is why ‘most modern browsers’ is the honest claim. If the clip is going on a website, listing the WebM first and the MP4 second in your video element lets every visitor get a version their browser can play.
Is my video uploaded to a server? Is it safe to convert MP4 to WebM here?
Your video is not uploaded at all. Fixpio’s converter runs entirely in your web browser, on your own device: the file is not sent anywhere, not stored by us and not seen by anyone else. When you close the tab, nothing of your video remains with us, because it never left your machine in the first place. It is also free to use, with no sign-up and nothing to install.